Tiahleigh Palmer told a classmate she was scared to go home and begged to stay with her family six days before she was allegedly killed by her foster father.

The 12-year-old girl went home with a friend from Marsden State School on Friday October 23 and asked the girl's aunt if she could stay with them as she was worried she would get into 'big trouble' if she returned to her foster home, 7 News reported.

Six days later, police will allege Tiahleigh was murdered by her foster father, Rick Thorburn, 56, in a bid to protect his son Trent Thorburn, 19, who had been sexually assaulting the young girl during the ten months she was in the family's care.

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Tiahleigh Palmer told a classmate she was scared to go home and begged to stay with her family six days before she was allegedly killed by her foster father

Julene Thorburn (left), 53, picked the 12-year-old up and took her home, where police allege she was killed by her foster father Rick Thorburn (right), 56, six days later

The woman Tiahleigh sought refuge from said she contacted the Office of Child Safety in Brown Plains when Tiahleigh insisted she did not want to go home, but was told it was common and to encourage the schoolgirl to return.

'She asked me if she could stay with me and I said I'm sorry I couldn't let you stay with me because I really don't know you for a start,' the aunt of Tiahleigh's classmate told 7 News.

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'She did tell me that if she does go home that she was going to get in big trouble and that's why she didn't want to go home,' the unidentified woman added.

The woman then contacted the Thorburns, and received a text from Julene advising she would come and collect her from the nearby home.

'She asked me if she could stay with me and I said I'm sorry I couldn't let you stay with me because I really don't know you for a start,' the aunt (pictured) of Tiahleigh's classmate said

The woman then contacted the Thorburns, and received a text from Julene (left) advising she would come and collect her from the nearby home, where it is alleged Trent Thorburn, 19, (right) had been having sex with her when his parents were out of the house

It has also been alleged in court Trent may have impregnated the young school girl

'Thank you and if she is worried about it tell her that just Julene is coming and she isn't in trouble,' the text message obtained by 7 News read.

The next time the woman heard from the Thorburns was on the morning Rick Thorburn told police he had dropped the 12-year-old off at school in her uniform and carrying a mambo backpack.

She received a text from Julene, who has been charged with perjury and perverting the course of justice, at about 1.30pm on October 30 stating she was concerned as Tiahleigh had disappeared from school.

The next time the woman heard from the Thorburns was on the morning Rick told police he had dropped the 12-year-old off at school in her uniform and carrying a mambo backpack

But police now allege Tiahleigh never made it to school and was slaughtered by her foster father at their family home (pictured) before her naked body was dumped in the Pimpana river

The 12-year-old's body was so badly decomposed police have struggled to determine how she died

'Hi its Tia's foster mum Julene. Tia has run from school again first thing this morning if you hear anything or if anyone has seen her today could you let me know,' the text read, adding in a further message that police had 'no leads' on her whereabouts.

But police now allege Tiahleigh never made it to school and was slaughtered by her foster father at their family home in Chambers Flat, Logan, before her naked body was dumped in the Pimpana river.

It took 11 months before any arrests were made in relation to Tiahleigh's death.

Trent admitted to a cousin via Facebook that he had incestuous sex with Tiahleigh and feared he impregnated her a day before his father is accused of killing the school girl, a court has heard.

But police did not pick up the admission during their initial investigations and only obtained the critical piece of evidence this month, despite the family facing a Crime and Corruption Commission hearing earlier this year. the Australian reported.

The family were taken into custody shortly after a blue Ford XR6 previously owned by Rick Thorburn was seized and forensically examined last week.

Rick Thorburn was arrested on Wednesday and collapsed while in police custody after being charged with Tiahleigh's murder and interfering with her corpse

Julene Thorburn, 54, (left) and another son, Josh, 20, (right) have been charged with perjury and attempting to pervert the course of justice.

Foster father Rick Thorburn was arrested on Wednesday and collapsed while in police custody after being charged with Tiahleigh's murder and interfering with her corpse.

He was placed in a medically induced coma and denied bail before regaining consciousness on Thursday.

His youngest son Trent was charged with incest, perjury and perverting the course of justice. The 19-year-old was also denied bail but is expected to reapply in the Supreme Court.

Thorburn's wife Julene, 54, and another son, Josh, 20, have been charged with perjury and attempting to pervert the course of justice.

They have been released on bail and will face court on October 10.

TIMELINE OF TIAHLEIGH PALMER'S MURDER

October 30, 2015: Tiahleigh was last seen about 8.10am when her foster father dropped her off near Marsden State High School.

November 5: Police appealed to the public for information on her disappearance and released an image of the 12-year-old.

November 6: Fisherman found her body on the banks of Pimpama River. She was no longer wearing her school uniform.

November 14: About 600 people attended her funeral.

February 15, 2016: A $250,000 reward for information which would lead to an arrest was offered by police.

March 23: Police forensically examined an empty house in Logan.

July 11: Queensland schools became required to inform parents and carers if a child was absent.

September 13: A blue Ford XR6 was seized by police and forensically examined.

September 19: Tiahleigh's mother said the car belonged to her foster carers.

September 20: Four people were taken into custody and her foster father was charged with her alleged murder.